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Author: Thomas Ritschel Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Research of solute transport fundamentally contributes to our understanding of soil functions as most processes in soils are dynamically driven and related to the transient conditions produced by the transport of solutes. For this reason, especially the transport of contaminants is frequently studied with laboratory scale column outflow experiments in an open-flow mode. This thesis presents a complementary approach of conducting saturated column experiments that is characterized by the recirculation of the effluent into the inflow via a mixing vessel and is therefore referred to as closed-flow mode column experiment. Depending on the ratio of the volume of the mixing vessel and the water-filled pore space, a damped oscillating concentration emerges in the effluent and in the mixing vessel. Oscillation frequency, damping and amplitude are thereby governed by the properties of the porous medium and the target substance. It was shown by column experiments with quartz sand that the appearance of oscillations can be controlled by using different mixing vessel solute volumes. The breakthrough data obtained within these experiments was then used to validate a numerical model that was derived by coupling the numerical solution of a transport equation with the model describing the mixing vessel in a loop. This model was used for a comprehensive sensitivity analysis to illustrate the response of the breakthrough curve to changes in the dispersion and the parameters describing adsorption with respect to strength, rate and nonlinearity. Each process thereby produced unique responses that confirm the high information content of closed-flow breakthrough data, which has shown to intrinsically contain information on the water content and the pumping rate as well. Finally, a numerical analysis of inverse parameter determination revealed a massive decrease in parameter uncertainty under optimal conditions, which renders the approach also highly relevant for practical applications.
Author: Thomas Ritschel Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Research of solute transport fundamentally contributes to our understanding of soil functions as most processes in soils are dynamically driven and related to the transient conditions produced by the transport of solutes. For this reason, especially the transport of contaminants is frequently studied with laboratory scale column outflow experiments in an open-flow mode. This thesis presents a complementary approach of conducting saturated column experiments that is characterized by the recirculation of the effluent into the inflow via a mixing vessel and is therefore referred to as closed-flow mode column experiment. Depending on the ratio of the volume of the mixing vessel and the water-filled pore space, a damped oscillating concentration emerges in the effluent and in the mixing vessel. Oscillation frequency, damping and amplitude are thereby governed by the properties of the porous medium and the target substance. It was shown by column experiments with quartz sand that the appearance of oscillations can be controlled by using different mixing vessel solute volumes. The breakthrough data obtained within these experiments was then used to validate a numerical model that was derived by coupling the numerical solution of a transport equation with the model describing the mixing vessel in a loop. This model was used for a comprehensive sensitivity analysis to illustrate the response of the breakthrough curve to changes in the dispersion and the parameters describing adsorption with respect to strength, rate and nonlinearity. Each process thereby produced unique responses that confirm the high information content of closed-flow breakthrough data, which has shown to intrinsically contain information on the water content and the pumping rate as well. Finally, a numerical analysis of inverse parameter determination revealed a massive decrease in parameter uncertainty under optimal conditions, which renders the approach also highly relevant for practical applications.
Author: J. W. Williams Publisher: Elsevier ISBN: 1483221229 Category : Science Languages : en Pages : 301
Book Description
Ultracentrifugal Analysis: In Theory and Experiment aims to tackle some outstanding problems in sedimentation analysis. The book presents topics such as the thermodynamics of diffusion and sedimentation; diffusion and sedimentation in multicomponent systems; and the frictional formalism in the flow equations of sedimentation. The text also includes topics such as solutions of the general differential equation for the ultracentrifuge; the interpolation diagram for calculating model Schlieren patterns for reversibly interacting systems; and sedimentation of reversibly aggregating substances. Articles on the effects of charge on the sedimentation, the diffusion and the sedimentation equilibrium of colloidal electrolytes; the basic equilibrium equations; and the sedimentation equilibrium in reacting systems are also considered. The book further tackles articles on the optical systems for sedimentation analysis; computational methods of ultracentrifugation; separation cells; and the magnetic bearing for an ultracentrifuge. Chemists, physicists, and biologists will find the book invaluable.
Author: Luis A. Cisternas Publisher: MDPI ISBN: 3039284002 Category : Technology & Engineering Languages : en Pages : 232
Book Description
Mineral processing deals with complex particle systems with two-, three- and more phases. The modeling and understanding of these systems are a challenge for research groups and a need for the industrial sector. This Special Issue aims to present new advances, methodologies, applications, and case studies of computer-aided analysis applied to multiphase systems in mineral processing. This includes aspects such as modeling, design, operation, optimization, uncertainty analysis, among other topics. The special issue contains a review article and eleven articles that cover different methodologies of modeling, design, optimization, and analysis in problems of adsorption, leaching, flotation, and magnetic separation, among others. Consequently, the topics covered are of interest to readers from academia and industry.
Author: Gregory S. Patience Publisher: Newnes ISBN: 0444538054 Category : Science Languages : en Pages : 389
Book Description
Experimental Methods and Instrumentation for Chemical Engineers is a practical guide for research engineers and students, process engineers and, consultants, and others in the chemical engineering field. This unique book thoroughly describes experimental measurements and instrumentation in the contexts of pressure, temperature, fluid metering, chromatography, and more. Chapters on physico-chemical analysis and analysis of solids and powders are included as well. Throughout the book, the author examines all aspects of engineering practice and research. The principles of unit operations, transport phenomena, and plant design form the basis of this discipline. Experimental Methods and Instrumentation for Chemical Engineers integrates these concepts with statistics and uncertainty analysis to define factors that are absolutely necessary to measure and control, how precisely, and how often. Experimental Methods and Instrumentation for Chemical Engineers is divided into several themes, including the measurement of pressure, temperature flow rate, physico-chemical properties, gas and liquid concentrations and solids properties. Throughout the book, the concept of uncertainty is discussed in context, and the last chapter is dedicated to designing and experimental plan. The theory around the measurement principles is illustrated with examples. These examples include notions related to plant design as well as cost and safety. Contains extensive diagrams, photos, and other illustrations as well as manufacturers' equipment and descriptions with up-to-date, detailed drawings and photos Includes exercises at the end of each chapter, helping the reader to understand the problem by solving practical examples Covers research and plant application, including emerging technologies little discussed in other sources
Author: Zhenhai Guo Publisher: Elsevier ISBN: 0123869625 Category : Architecture Languages : en Pages : 332
Book Description
Introduction Part 1 Mechanical Behavior of Materials at Elevated Temperatures Chapter 1 Strength of Concrete at Elevated Temperatures Chapter 2 Deformation of Concrete at Elevated Temperature Chapter 3 Temperature-Stress Paths and Coupling Constitutive Relation of Concrete Chapter 4 Mechanical Behavior and Constitutive Relation of Reinforcement at Elevated Temperatures Part 2 Temperature Field on Cross-Section of Structural Member Chapter 5 Temperature-Time Curve of Fire and Equation of Heat Conduction Chapter 6 Theoretical Analysis of Temperature Field Chapter 7 Calculation Charts for Temperature Field on Cross-Section Part 3 Mechanical Behavior of Members and Structures at Elevated Temperatures Chapter 8 Behavior of Flexural Members At Elevated Temperature Chapter 9 Behavior of Compressive Member At Elevated Temperatures Chapter 10 Behavior of Statically Indeterminate Structures At Elevated Temperatures Part 4 Theoretical Analysis and Practical Calculation Method Chapter 11 General Mechanical Characteristics of Inhomogeneous Section Chapter 12 Finite Element Analysis of Loading History for Structures Chapter 13 Practical Calculation Methods for Ultimate Strength of Member and Structure at Elevated Temperature Chapter 14 Fire Resistance Analysis and Damage Grade Evaluation of Structure.
Author: John P.T. Mo Publisher: Springer Nature ISBN: 9819936721 Category : Technology & Engineering Languages : en Pages : 178
Book Description
This book consists of selected papers presented at the 8th International Conference on Mechanical, Automotive and Materials Engineering (CMAME 2022), held in Hanoi, Vietnam, on 16–18 December 2022. Readers find this book a vehicle for the dissemination of research results on latest advances made in this area. It is expected that the publication of the research papers with the advanced topics listed in this book will further promote high standard academic research in the field and make a significant contribution to the development of human society. Topics that will be covered in this book include but not limited to: materials science and engineering; engine system design and power machinery; mechanical design-manufacture and automation; design and analysis of robot systems; automobile design and manufacturing engineering; thermal and fluid mechanics analysis; aircraft structural design and system control; control theory and engineering applications; electronic information technology. This book is intended for researchers, engineers and advanced postgraduate students in the fields of automotive, production, industrial engineering and design.
Author: Thomas Ritschel
Author: Thomas Ritschel
Author: David Garfield Owen
Author: J. W. Williams
Author: Luis A. Cisternas
Author: Gregory S. Patience
Author: 
Author: Purdue University. Engineering Experiment Station
Author: Stanley W. Mayer
Author: Zhenhai Guo
Author: John P.T. Mo